User guide

Developers guidelines | AT commands
53 June 2010
AT+DR Data compression reporting
Test command
response: +DS: (list of supported <direction>s),(list of supported
<compression_negotiation>s),(list of supported <max_dict>s),(list of
supported <max_string>s)
Parameters:
<direction>: Specifies the desired direction(s) of operation of the data compression
function from the TE point of view.
<direction> Description
0 Disable V.42 bis
1 Enable V.42 bis in transmit direction only
2 Enable V.42 bis in receive direction only
3 Enable V.42 bis compression in both directions.
Default value
<compression_
negotiation>: Specifies if the phone should continue to operate if the desired result is not
obtained.
<compression_nego
tiation>
Description
0 Do not disconnect if compression is not negotiated
according to direction. Default value
1 Disconnect if compression is not negotiated
according to direction
<max_dict>: Maximum number of dictionary entries to be negotiated.
<max_dict> Description
512 to 2048 Maximum dictionary size
Note: Must be given in multiples of 512
1024 Default value
<max_string>: Maximum string length to be negotiated.
<max_string> Description
6 to 250 Maximum string length
32 Default value
Description: Controls whether or not the extended-format +DR intermediate result
code is transmitted from the phone to the terminal equipment.The +DR:
<type> reported represents the current (negotiated or renegotiated) TAE-
TE data compression type.
If enabled, the intermediate result code is transmitted after error control
negotiation (handshaking), when the TAE has determined which data com-
pression technique will be used (if any) and the direction of operation.
Note: This command is only applicable to CS (Circuit Switched) data calls.
Set command: AT+DR=<value>